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#
# CDDL HEADER START
#
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# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# fields enclosed by brackets "[]" replaced with your own identifying
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#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.

. $STF_SUITE/include/libtest.kshlib

function usedby_supported
{
	fs_prop_exist "usedbysnapshots"
	return $?
}

function _check_used # dataset
{
        typeset dataset=$1

	if [[ "$(get_prop type $dataset)" == "snapshot" ]]; then
		return
	fi

	used=$(get_prop used $dataset)
	usedbychildren=$(get_prop usedbychildren $dataset)
	usedbydataset=$(get_prop usedbydataset $dataset)
	usedbyrefreservation=$(get_prop usedbyrefreservation $dataset)
	usedbysnapshots=$(get_prop usedbysnapshots $dataset)
	(( used_sum = usedbychildren + usedbydataset + \
		usedbyrefreservation + usedbysnapshots ))
	if (( used != used_sum )); then
		log_fail "$dataset: used($used) is not the sum($used_sum) of usedby*"
	fi
}

function check_used # dataset
{
	typeset dataset=$1
	for child in $($ZFS list -rH -t filesystem,volume -o name $dataset)
	do
		_check_used $child
	done
}

function check_usedbychildren # dataset
{
	typeset dataset=$1
	typeset -i usedbychildren_sum=0
	typeset -i parent_usedbychildren=0
	for child in $($ZFS list -rH -t filesystem,volume -o name $dataset)
	do
		if [[ "$(get_prop type $child)" == "snapshot" ]]; then
               		continue
        	fi

		# parent
		if [[ "$child" == "$dataset" ]]; then
			parent_usedbychildren=$(get_prop usedbychildren $child)
		else #child
			reservation=$(get_prop reservation $child)
			used=$(get_prop used $child)
			if (( reservation > used )); then
				(( usedbychildren_sum += reservation ))
			else
				(( usedbychildren_sum += used ))
			fi
		fi
	done

        if (( parent_usedbychildren != usedbychildren_sum )); then
                log_fail "$dataset: usedbychildren($parent_usedbychildren) is not the sum($usedbychildren_sum) of used by children"
        fi
}

function _check_usedbydataset # dataset
{
        typeset dataset=$1
	if [[ "$(get_prop type $dataset)" == "snapshot" ]]; then
		return
	fi

	usedbydataset=$(get_prop usedbydataset $dataset)
	referenced=$(get_prop referenced $dataset)
	
	is_cloned=$(get_prop is:cloned $dataset)

	if [[ "$is_cloned" == "yes" ]]; then
		if (( usedbydataset > referenced )); then
			log_fail "$dataset(cloned): usedbydataset($usedbydataset) is more than referenced($referenced)"
		fi
	else
		#
		# if non-clones, should usedbydataset == referenced
		#
		if (( usedbydataset != referenced )); then
			log_fail "$dataset: usedbydataset($usedbydataset) is not equal to referenced($referenced)"
		fi
	fi
}

function check_usedbydataset # dataset
{
	typeset dataset=$1
	for child in $($ZFS list -rH -t filesystem,volume -o name $dataset)
	do
		_check_usedbydataset $child
	done
}

function _check_usedbyrefreservation # dataset
{
        typeset dataset=$1
	if [[ "$(get_prop type $dataset)" == "snapshot" ]]; then
		return
	fi

	usedbyrefreservation=$(get_prop usedbyrefreservation $dataset)
	referenced=$(get_prop referenced $dataset)
	refreservation=$(get_prop refreservation $dataset)
	(( diff_ref = refreservation - referenced ))
	if (( usedbyrefreservation > refreservation || \
		usedbyrefreservation < diff_ref )); then
		log_fail "$dataset: usedbyrefreservation($usedbyrefreservation) checking is not ok"
	fi
}

function check_usedbyrefreservation # dataset
{
	typeset dataset=$1
	for child in $($ZFS list -rH -t filesystem,volume -o name $dataset)
	do
		_check_usedbyrefreservation $child
	done
}

function check_usedbysnapshots # dataset
{
	typeset dataset=$1
	typeset -i usedbysnapshots_sum=0
	typeset -i parent_usedbysnapshots=0
	for child in $($ZFS list -rH -t filesystem,volume,snapshot -o name $dataset)
	do
		# parent
		if [[ "$child" == "$dataset" ]]; then
			parent_usedbysnapshots=$(get_prop usedbysnapshots $child)
			continue
		fi

		if [[ "$(get_prop type $child)" != "snapshot" ]]; then
               		continue
        	fi

		if [[ "$child" != "$dataset@"* ]]; then
			continue
		fi

		# snapshot
		used=$(get_prop used $child)
		(( usedbysnapshots_sum += used ))
	done

        if (( parent_usedbysnapshots < usedbysnapshots_sum )); then
                log_fail "$dataset: usedbysnapshots($parent_usedbysnapshots) is not more than or equal to" \
				"the sum($usedbysnapshots_sum) of used of snapshots"
        fi
}

